I can do that for sure, I will note however that it only fills with the pump on. So here's my update as I'm in it right now (as a passenger) the pump was off for the last hour and my wife had left the kitchen faucet set to wide open by mistake. I closed the faucet valve, turned on the pump and checked it, it was not building pressure at all, no flow.
I then checked the toilet and noted the slightest trickle from the bowl sprayer, I stomped the valve open and it started spraying full blast sputtering at first to purge the air and water, now all pressure is restored and the bowl is currently not filling itself.

Air in the lines caused a lack of hydraulic pressure. Once the pressure was restored the valve seated and the flow stopped. It still seems like your pump is the culprit, and the toilet valve seal is a secondary, as it stops leaking if under constant pressure, should seal under any pressure situation.

Kohesh, Mine did the same overflow a couple of weeks ago, except my water tank was below the pump input line, so it was sucking air. Every so often the pump would "catch" some water. It appeared the "demand" for the pump stayed on, and it just kept pumping. I ended up turning the pump off and ultimately replace the pump. Hope that helps! Craig

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Craig

Finally completed all State visits in August 2011 with a trip to North Dakota.

Great community here, THANKS Definitely what it is. toilet started running today after pump builds pressure from, stomp the pedal, then it seals-problem done.
So, my coach is sitting at FL Gaffney right now for some other issues, anybody know the part # or can point me to a parts list/diagram for the correct commode?

I have a followup for this thread. It turns out the the root cause of all the water related issues I experienced were a result of the water filter. I would not have thought it to be so, but without a filter in place, and later with a new filter installed All of my issues have passed. Even more surprising was the weight of the old filter, i suppose that is a good thing. I believe the toilet overflowing was a result form inadequate pressure to keep the valve closed